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How To use XP_CRYPT GUI Introduction What is XP_CRYPT System requirements Free version limitations End user license agreement Installing XP_CRYPT Installation procedure Activation XP_CRYPT API What's new Encryption methods overview Session xp_crypt_set_var xp_crypt_get_var xp_crypt_close_session xp_crypt_init_session xp_crypt_set_option Asymmetric keys DSA xp_dsa_free_key xp_dsa_load_key xp_dsa_save_key xp_dsa_generate_couple RSA xp_rsa_generate_couple xp_rsa_generate_pub_key xp_rsa_load_key xp_rsa_priv_dec xp_rsa_pub_enc xp_rsa_save_key xp_rsa_free_key Digital signatures DSA xp_dsa_verify xp_dsa_sign RSA xp_rsa_sign xp_rsa_verify Hashing xp_crypt xp_md5 xp_sha1 Symmetric encryption AES128 xp_aes128_decrypt xp_aes128_encrypt AES xp_aes_decrypt xp_aes_encrypt DESX xp_desx_decrypt xp_desx_encrypt RC4 xp_rc4_decrypt xp_rc4_encrypt Triple DES xp_des3_encrypt xp_des3_decrypt Error codes Tutorial How to use GUI Advanced technique (Old) Table encryption (Old) Troubleshooting Troubleshooting overview

xp_dsa_free_key This function frees the key referenced by the handle. After the handle is freed you cannot use it for any encryption functions. Always call this function for every DSA key before terminating your SQL connection.  Syntax xp_dsa_free_key  { key_handle } Arguments key_handle VARCHAR. Handle of the key that is to be freed. Permissions Execute permissions default to the public role. Return Code Values 0 - success, or Error code if failed.